Research Advances in Genetic Mechanisms of Major Cucumber Diseases Resistance

Abstract

Cucumber (Cucumis sativus L.) is an important economic vegetable crop worldwide that is susceptible to various common pathogens, including powdery mildew (PM), downy mildew (DM), and Fusarium wilt (FM). In cucumber breeding programs, identifying disease resistance and related molecular markers is generally a top priority. PM, DM, and FW are the major diseases of cucumber in China that cause severe yield losses and the genetic-based cucumber resistance against these diseases has been developed over the last decade. Still, the molecular mechanisms of cucumber disease resistance remain unclear. In this review, we summarize recent findings on the inheritance, molecular markers, and quantitative trait locus mapping of cucumber PM, DM, and FM resistance. In addition, several candidate genes, such as PM, DM, and FM resistance genes, with or without functional verification are reviewed. The data help to reveal the molecular mechanisms of cucumber disease resistance and provide exciting new opportunities for further resistance breeding.

Genome-Wide Scanning Loci and Differentially Expressed Gene Analysis Unveils the Molecular Mechanism of Chlorantraniliprole Resistance in Spodoptera frugiperda

“…21 The emergence of target, metabolic, and epidermal penetration resistance is essentially caused by the enrichment of specific gene mutations in insects under the pressure of insecticide selection. 22 For species in which genomes have been successfully assembled, the genetic variation at the wholegenome level can be maximized by genome resequencing. For instance, genome-wide selected loci and their enrichment of insecticide resistance-related genes were identified in imidacloprid-resistant and -susceptible strains of brown planthopper.…”